Hi Vinod,
You can improve the confidence level of a field by adding a Format Expression to indicate the anticipated string format, Formulas and List also help Decipher be more certain about it's Capture confidence.
However, the low confidence level may also be due to the OCR process, which is harder to improve. The OCR stage (which includes 2 OCR engines) will provide a confidence level for each character and this can be affected by things such as a low quality image (<300dpi) or a coloured background where you're reading the wanted text.
There are fewer options to help improve this, though the ones outline above may have an impact. You may need to consider if it's possible to use a higher quality image (increase the dpi of scanned documents to 300dpi) or convert the image to greyscale before uploading.
Thanks
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Ben Lyons
Product Consultant - Decipher Specialist
Blue Prism
UK
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Ben Lyons
Principal Product Specialist - Decipher
SS&C Blue Prism
UK based